Spark-arrester.



G. H. B. STEELE, A. H. BOULTER & J. HARGREAVES.

' SPARK ARRESTER.

APPLIGATION FILED MAR.25,1910.

1,023,769. Patented Apr. 16, 1912.

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GEORGE I-IENERY BENBOW STEELE, ARTHUR HAROLD BOULTER, AND JOSEPH HARGREAVES, OF PERTH, WESTERN AUSTRALIA, AUSTRALIA.

SPARKARRESTER.

Specification of Letters Patent.

Patented apr. 1e, 1912.

Application led March 25, 1910. Serial No. 551,534.

Y the action of the exhaust steam and said fan rotates in a horizontal plane and is suitably held in position above the exhaust steam pipe exit and within the chimney or funnel. le may use one, two or more of these rotary fans.

The second feature resides in the use of a cone which diverts and guides the steam` blast and sparks on to the under side of the fan blades while the third main feature consists in forming an annular or partly annular passage around the funnel down which the dead sparks are discharged.

Our invention will now be explained with the aid of the attached drawing, in which` Figure l is a sectional view showing a funnel equipped with the improved spark arrester; and Fig. 2 is a detail perspective View, showing more particularly the cross sectional outline of the fan blades.

In said drawing a are the fan blades of any number, secured to their hub Z) which is rotatable upon a central spindle c between which and said hub upper and lower ball bearings as d are interposed. This hub and the attached fan blades are held rigidly in position by and between the crown and footI bridges as e and f and are made secure by the nuts c and f and also by the lock nuts f2. The fan is reinforced by the arms g the ends of which are made secure to the hub aforesaid and to a ring g which is suitably secured to the fan blades as shown. The bridges e and f are secured to the rings 7' and j', said rings being riveted to the cylindrical wall dening the spark chamber which latter contains the fan and operative parts. The wall k is connected by the stays 7a to the funnel proper as m of the boiler and above said funnel is bowed outwardly to aord an enlarged inclosure for the fan and to provide for the return of any sparks which may have been thrown against said wall. The annular or partly annular passage a for the discharge of the sparks intervenes between the walls and m and the sparks which pass through the passage a are disposed of by any suitable known means. Immediately beneath the fan and coaxially with the funnel m we place t-he inverted cone as 79 which diverts and guides the exhaust steam and upwardly carried sparks against the underside of the fan blades from whence they are de flected down the annular passage a as shown by the arrows.

The action of our appliance is automatic since the revolving fan blades which projectover the passage '11, are set on a slight upward incline and draw the sparks toward their periphery so that such sparks are made to strike against the wall le and thus caused to fall down the passage a.

By reason of the use of a revolving fan as a part of an arrangement in accordance with the present invention we provide a moving or live barrier against the escape of sparks or cinders but which does not act as a dead bailie to interfere with the free exit of the exhaust steam.

That we claim as our invention and desire to secure by Letters Patent isl. In a spark arrester, a funnel and a wall concentrically surrounding the same in spaced relation and projecting upwardly therebeyond, the said projecting wall portion defining a spark chamber, a fan sup ported in the spark chamber for rotation in a horizontal plane, the fan having its blades set at a slight upward inclination in a longitudinally continuous plane throughout their extent and extending over the passage which intervenes between the funnel and the wall, the said blades being formed to deflect the sparks striking thereagainst into the said passage, and a cone arranged in an inverted position coaxially under the fan, the cone being proportioned and positioned to deflect the sparks issuing from the funnel toward the outer ends of the blades of the fan.

2. In a spark arrester, a funnel and a wall concentrically surrounding the same in spaced relation and projecting upwardly therebeyond, the projecting portion of said wall defining a spark chamber and being bowed outwardly to aord an enlarged inclosure, a fan arranged in the inclosure and rotatable in a horizontal plane, the blades of the fan being disposed in a longitudinally continuous plane throughout their extent and projecting over the passage which intervenes between the funnel and the wall, and being formed to deflect the sparks strik ing thereagainst into the said passage, and a issuing from the Jfunnel toward the outer ends of the blades of the fan.

In testimony whereof we have signed our names to this specification in the presence of 15 two subscribing witnesses.

GEORGE HENERY BENBOW STEELE. ARTHUR HAROLD BOULTER. JOSEPH HARGREAVES.

cone arranged in an inverted position CoaXi- Vitnesses: ally under the fan, the cone being propor- RICHARD SPARROW, tioned and positioned to deflect the sparks A. M. VANCE;r

Copies of this patent may be obtained for tive cents each, by addressing the Commissioner of Patents. Washington, D. C. 

